Add comment and lint (#3022)

Co-authored-by: Adrian Marin <adrian@adrianthedev.com>

spec/dummy/app/models/user.rb

@@ -48,6 +48,7 @@ class User < ApplicationRecord
   scope :admins, -> { where "(roles->>'admin')::boolean is true" }
   scope :non_admins, -> { where "(roles->>'admin')::boolean != true" }
 
+  # We're using a setter here because we want to test that the field is working properly with a non-db backed field.
   attr_writer :permissions
 
   def is_admin?
@@ -96,7 +97,7 @@ def permissions
       create: true,
       update: false,
       read: true,
-      delete: true,
+      delete: true
     }
   end
 end